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Why are superconducting qubits superior to other types of experimental realisation of qubits? I assume this because Dwave, IBM, rigetti among other companies in the quantum computing business use superconducting qubits.

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    $\begingroup$ This would be a good question for SE.QuantumComputing. $\endgroup$ – Nat May 9 '18 at 21:02
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    $\begingroup$ Not all do. See e.g. Xanadu, aimed at optical quantum computing, or Microsoft research, striving to realize topological quantum computation $\endgroup$ – glS May 10 '18 at 7:34
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The time scale $\tau$ scale for decoherence usually goes like some power of the temperature $T$. E.g., for a free electron undergoing Thomson scattering by blackbody radiation, $\tau\propto T^{-5}$. This suggests that you want the temperature as low as possible. In general, an ultra-low-temperature electronic device is probably going to be superconducting, both because nonzero resistance would create heat and because many materials happen to become superconducting at very low temperatures.

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